Britain's Prince William and wife Kate, Duchess of Cambridge, hold the Prince of Cambridge outside of St. Mary's Hospital in London where the duchess gave birth Monday. The royal couple are expected to head to Kensington Palace with their son, the third in line to the British throne.

Britain's Prince William and wife Kate, Duchess of Cambridge, hold the Prince of Cambridge outside of St. Mary's Hospital in London where the duchess gave birth Monday. The royal couple are expected to head to Kensington Palace with their son, the third in line to the British throne. (BEN STANSALL / AFP/Getty Images)

Britain's Prince William and wife Kate, Duchess of Cambridge, hold the Prince of Cambridge outside of St. Mary's Hospital in London where the duchess gave birth Monday.

Britain's Prince William and wife Kate, Duchess of Cambridge, hold the Prince of Cambridge outside of St. Mary's Hospital in London where the duchess gave birth Monday. (Lefteris Pitarakis / Associated Press)